Image display device

a display device and image technology, applied in the field of image display devices, can solve the problems of large display element size, difficult to correct aberration and distortion caused by the holographic optical element, and difficult to display images with a wide angle of view at a high resolution, so as to reduce the size of the optical system, reduce the influence of eye movement and interpupillary distance fluctuation, and improve the effect of wear

Active Publication Date: 2017-08-10
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The image display device described in this patent has several technical effects. First, by using a mirror to reflect light from the light source optical system, the optical path between the light source and the light scanning device is turned back, reducing the size of the optical system. Second, the pupil magnifying optical system is positioned on the optical path, allowing for a see-through property while reducing the influence of eye movement and interpupillary distance fluctuation. Third, the light scanning device can be positioned further from the viewer's head, reducing the thickness of the external portion of the device and improving its appearance and feel of wearing.

Problems solved by technology

In the video display device, since only the holographic optical element has an optical power, it is difficult to correct aberration and distortion which are caused by the holographic optical element.
Therefore, it is difficult to display an image with a wide angle of view at a high resolution, that is, an image of a large size.
In PTL 1, a liquid crystal display element is given as an example of the display element; however, in a case in which a device which has a two-dimensional external shape such as a liquid crystal display element is used, there is a problem in that the size of the display element becomes great.
However, in the device of PTL 2, in a case in which the diameter of the laser beam to be scanned is narrow, there is a problem in that the laser beam shifts from the position of the pupil when the eye is moved, and the image becomes invisible.
Additionally, since the interval between the right eye and the left eye, the so-called interpupillary distance differs depending on the person, there is a problem in that when the user changes, the image becomes invisible.
However, in the device of PTL 3, since the light guiding plate also stretches outside of the region in front of the eyes of the viewer which is necessary for the image display and the light guiding plate overhangs the side of the face, the device increases in size, and this is not preferable from the standpoint of external appearance.
However, in this configuration, since the diffraction grating is displaced in front of the eyes of the viewer, the see-through property is impaired.

Method used

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Embodiment Construction

[0029]Hereinafter, description will be given of the embodiment of the invention using FIGS. 1 to 4.

[0030]The image display device of the present embodiment is an example of a head mounted display which a user wears on the head of the user to use.

[0031]In the following description, head mounted display (Head Mounted Display) will be shortened to HMD.

[0032]FIG. 1 is a diagram illustrating a state in which the user wears the HMD of the present embodiment.

[0033]FIG. 2 is a perspective diagram of the HMD of the present embodiment.

[0034]The dimensions may be illustrated at different scales depending on the configuration element in order to render the configuration elements easier to view in all of the following diagrams.

[0035]As illustrated in FIG. 1, an HMD 300 of the present embodiment is worn on the head portion and used by the user with the feeling of wearing eyeglasses. The HMD 300 of the present embodiment is a see-through type (transmitting type) HMD. According to the HMD 300 of th...

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PUM

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Abstract

An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.

Description

TECHNICAL FIELD[0001]The present invention relates to an image display device.BACKGROUND ART[0002]In recent years, an image display device which is used in a state of being worn on a head portion of a viewer such as a head mounted display is provided as a wearable information device. For example, PTL 1 which is described below discloses a video display device which is provided with a light source, a display element which modulates light from the light source and displays a video, and a viewing optical system which guides the video light from the display element to a pupil of the viewer. In the video display device, a holographic optical element is disposed in front of the eyes of the viewer, and the holographic optical element transmits light from the outdoor scenes. Accordingly, the viewer is capable of visually recognizing an image of the outdoor scenes in addition to a video from the display element. An image display device with which it is possible to visually recognize both a v...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G02B27/01G02B5/32F21V8/00G02B27/00
CPCG02B27/0172G02B27/0025G02B5/32G02B2027/0178G02B6/0005G02B2027/0174G02B2027/011G02B27/0081G02B26/0833G02B26/101G02B2027/0145H04N5/64
InventorYOKOYAMA, OSAMUYONEKUBO, MASATOSHITAKEDA, TAKASHIISHIDA, DAISUKEIDE, MITSUTAKASORIMACHI, HIDEMITSU
OwnerSEIKO EPSON CORP